Gas sensor having oxide thin film and method for sensing gas using the same

Gas sensing apparatus includes a sensor unit configured to output sensor data in response to the input gas; A database comprising at least one first vector of the sensor data received from the sensor unit for a single gas storage unit is stored; And a detecting unit configured to detect the aimed gas by comparing a sensor data for on the basis of the database, the second the gas to generate the extended database, and said sensor portion including a vector corresponding to one or more of the gas mixture and the expanded database It includes. According to the gas sensing device, it is possible to recognize all of the single-gas and mixed gas, and only the classification database for a single gas.